If you are looking for a "useful review" of how the MP4 format works for storing and streaming digital media, it is the most common container for both video and audio.
They explicitly do not accept flash, thumb, or jump drives for security reasons. MP4 Format & Media Storage Dod (157) mp4
Watch this review to see how the DDM4 V7 performs in the field and why it's considered a top-tier AR-15: DD4 V7 SLW — Still Worth It? YouTube• Feb 22, 2026 DoD Prepublication Security Review (DOPSR) If you are looking for a "useful review"